I use a G3 B&W with the QT4.02 Pro version and know that the memory allocation locations are for the viewer,player and control box only that I know of.
Other than the Apple web site there are an incredible amount of QuickTime information archived and accessable to anyone at, "The Little QuickTime Page" @ http://www.judyandrobert.com/quicktime/
There you will find all sorts of QuickTime/QuickDraw information as well as a huge host of enhancement links to connected information regarding the QuickTime archtechture.
I also think that having the pro key enhances QuickTime's abilities quite a bit better than the free download version. QuickDraw seems to work best having the developers version but when downloading QuickTime from the Apple web site I have also noticed a slight speed performance difference between the, "Full Version" and the, "Developers Version" in that the simple "Full Version" seemed to out-perform the more serious version for some weird reason. Running yer Mac with VM on or off makes a performance difference as well. I have found that it works a bit smoother with VM (Virtual Memory) on and that when utilizing real RAM allocation to any of the components or the machine itself it is a trial and error deal till you get it set just right or it will act irratic one way or the other. Hope that this helped a little. ")
Your "Preferrences" in either Mac will also play a part in performance when rendering or animating both in the Mac itself and the application. Pref's regarding lighting and textures make all the differences in the world sometimes.
ps: Got any experience with two monitors and VW?
Coloredpencilguy http://members.tripod.com/~Coloredpencilguy/index-2.html